Permanent magnet opening and closing type DC intelligent circuit breaker

Abstract

The invention discloses a permanent magnet opening and closing type DC intelligent circuit breaker, comprising a base, an incoming busbar, a dynamic contact electrically connected with the incoming busbar, a dynamic contact supporting part, a static contact, an outgoing busbar electrically connected with the static contact, a static contact supporting part, an operating mechanism used for drivingthe dynamic contact to open and close and an arc quenching mechanism used for quenching arc; wherein, the arc quenching mechanism comprises an arcing shield and an arcing ring; the operating mechanism comprises a permanent magnet type electromagnetic actuating mechanism, an insulating driving rod and a clamping rod; the permanent magnet type electromagnetic actuating mechanism is provided with a telescopic actuating rod and a solenoid coil; one end of the clamping rod is connected with the middle of the dynamic contact supporting part in a rotary manner by a rotating shaft; the other end of the clamping rod is provided with a waist hole and is connected with one end of the insulating driving rod by a rotating shaft which passes through the waist hole; the other end of the insulating driving rod is fixedly connected with the actuating rod. The circuit breaker has simplified structure, fast breaking speed and few mechanical failure sources and can stably and reliably run for a long time.

Description

technical field [0001] The invention belongs to the technical field of DC switches, and in particular relates to an intelligent DC circuit breaker. Background technique [0002] DC circuit breakers are mainly used in industrial and mining electric locomotives in my country to protect DC motors from short-circuit or overload. The existing DC fast circuit breaker generally adopts DC solenoid electromagnet to operate and drive. Compared with the operating mechanism made of DC motor and fan, the structure is relatively simple, but its operating current is large and the opening time is long. Therefore, it is necessary to increase the diameter of the wire and the size of the electromagnet, so that the volume of the entire circuit breaker becomes larger. Due to the self-overheating and impact force caused by the increase in the size of the electromagnet, it is difficult to meet the frequent operation requirements of the electric locomotive. [0003] Patent literature CN2105761U d...

AI Technical Summary

Problems solved by technology

attached from its manual figure 1 It can be clearly observed that the structure of the linkage mechanism is very complex, with many parts, which are prone to failure and difficult to operate reliably for a long time; in addition, as we all know, since DC has no zero point, its arc extinguishing is more difficult than AC arc extinguishing , and the arc extinguishing system of this kind of DC circuit breaker is relatively simple, only relying on the arc extinguishing plate to lead the arc to the arc extinguishing cover, the arc extinguishing effect is poor, so its arc extinguishing effect needs to be improved urgently

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